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Issue 2301913002: Rename SloppyBlockWithEvalContextExtension to ContextExtension (Closed)
Patch Set: updates Created 4 years, 3 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef V8_CONTEXTS_H_ 5 #ifndef V8_CONTEXTS_H_
6 #define V8_CONTEXTS_H_ 6 #define V8_CONTEXTS_H_
7 7
8 #include "src/heap/heap.h" 8 #include "src/heap/heap.h"
9 #include "src/objects.h" 9 #include "src/objects.h"
10 10
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291 // contexts inside a function. It provides access to the 291 // contexts inside a function. It provides access to the
292 // incoming context (i.e., the outer context, which may 292 // incoming context (i.e., the outer context, which may
293 // or may not become the current function's context), and 293 // or may not become the current function's context), and
294 // it provides access to the functions code and thus it's 294 // it provides access to the functions code and thus it's
295 // scope information, which in turn contains the names of 295 // scope information, which in turn contains the names of
296 // statically allocated context slots. The names are needed 296 // statically allocated context slots. The names are needed
297 // for dynamic lookups in the presence of 'with' or 'eval'. 297 // for dynamic lookups in the presence of 'with' or 'eval'.
298 // 298 //
299 // [ previous ] A pointer to the previous context. 299 // [ previous ] A pointer to the previous context.
300 // 300 //
301 // [ extension ] A pointer to an extension JSObject, or "the hole". Used to 301 // [ extension ] A pointer to a ContextExtension object, or "the hole". Used
302 // implement 'with' statements and dynamic declarations 302 // to implement 'with' statements and dynamic declarations
303 // (through 'eval'). The object in a 'with' statement is 303 // (through 'eval'). The object in a 'with' statement is
304 // stored in the extension slot of a 'with' context. 304 // stored in the extension slot of a 'with' context.
305 // Dynamically declared variables/functions are also added 305 // Dynamically declared variables/functions are also added
306 // to lazily allocated extension object. Context::Lookup 306 // to lazily allocated extension object. Context::Lookup
307 // searches the extension object for properties. 307 // searches the extension object for properties.
308 // For script and block contexts, contains the respective 308 // For script and block contexts, contains the respective
309 // ScopeInfo. For block contexts representing sloppy declaration 309 // ScopeInfo. For block contexts representing sloppy declaration
310 // block scopes, it may also be a struct being a 310 // block scopes, it may also be a struct being a
311 // SloppyBlockWithEvalContextExtension, pairing the ScopeInfo 311 // ContextExtension, pairing the ScopeInfo with an extension
312 // with an extension object. 312 // object.
313 // 313 //
314 // [ native_context ] A pointer to the native context. 314 // [ native_context ] A pointer to the native context.
315 // 315 //
316 // In addition, function contexts may have statically allocated context slots 316 // In addition, function contexts may have statically allocated context slots
317 // to store local variables/functions that are accessed from inner functions 317 // to store local variables/functions that are accessed from inner functions
318 // (via static context addresses) or through 'eval' (dynamic context lookups). 318 // (via static context addresses) or through 'eval' (dynamic context lookups).
319 // The native context contains additional slots for fast access to native 319 // The native context contains additional slots for fast access to native
320 // properties. 320 // properties.
321 // 321 //
322 // Finally, with Harmony scoping, the JSFunction representing a top level 322 // Finally, with Harmony scoping, the JSFunction representing a top level
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527 #endif 527 #endif
528 528
529 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); 529 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
530 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); 530 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
531 }; 531 };
532 532
533 } // namespace internal 533 } // namespace internal
534 } // namespace v8 534 } // namespace v8
535 535
536 #endif // V8_CONTEXTS_H_ 536 #endif // V8_CONTEXTS_H_
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